Pencil sharpener



FIG. 1 is a perspective view of a pencil sharpener, showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being the mirror image thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a pencil sharpener, as shown and described. 